Replacing a BOA liner with ...?

At hand is a pair of BD touring boots with BOA liners. I wish to replace the liner with a lace up liner that would have the approximate warmth and flex of an Intuition Power Wrap (non plug). A warm Zipfit Gara (if such a thing exists). What would my options be?

Primary use will be in VT, NH, QC. I am not willing to compromise on warmth.

Until I finished reading your post I was going to say get a zipfit. Still I can't think of another option, the zip is more supportive than the Intuition but maybe not as warm. However, there are nice improvements happening regularly with Zipfit and although the toe material is not as thick as Intuition it is neoprene and provides substantial improvement in warmth over factory liners.